I think that there are 2 areas of PD "logic" that need recognising here.
Firstly, a transition is better defined as an overlap with a specific pattern, it is not a stand alone, time defined entity.
Logically, therefore, the overall length of two overlapped clips will be shortened by the length of the overlap.
In the PD timeline, events are applied from time 0 onwards, there can be no "blank" spaces in the main timeline (as opposed to the PiP tracks).
Therefore, only the clip after a transition can be "moved" - towards T0 - to give the overlap, although both clips share the length of the overlap equally.
Secondly, the length of a clip can be defined in time (mins and secs) but the PD timeline is laid out in time and frames.
At frame level the clips remain the same length but the overall time line shows a shortening equal to the length of the transition. Visually, this may appear as the second clip being shortened but it actually remains the same length.
It is also worth noting that in editing, time may need to be translated into frames, so a .5 sec trim in a PAL project (25fps) is 12.5 frames, which is not possible - it is either 12 or 13 - whereas it is 15 frames in a NTSC project and therefore possible.
The minimum possible "length" of a transition appears to be 2 frames.
In practical terms, when a clip is actually too short for the overlap and the effect is spoiled, here are 3 suggestions :
Make up a custom transition as a stand alone clip and place this between the main clips,
Abandon the transition and use a PiP track overlay/colourboard instead
Take a snapshot of the last frame of the 1st clip and the first frame of the 2nd clip and use them, with suitable durations, to help the overlap look better.
The audio sync is a more difficult problem to overcome. Just for information, the minimum distance for audio markers on the waveform "rubber band" appears to be 0.2 secs = 5 frames for PAL and 6 frames for NTSC.
Cheers
Adrian
This message was edited 1 time. Last update was at Feb 24. 2010 18:05
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